TWI222838B - Packaging method of organic electroluminescence light-emitting display device - Google Patents

Abstract

An organic electroluminescence light-emitting display device is disclosed, which comprises: a glass substrate having a light-emitting device on its surface, which is a lamination formed of an anode conduction layer, an organic light-emitting material layer and a cathode metal layer; a dry layer coated on the surface of the edge frame in the glass substrate; an encapsulation layer coated on the surface of edge frame in the glass substrate; and a back lid plate whose edge frame is joined with the surface edge frame of the glass substrate, so as to form a sealed space.

Description

1222838

The present invention relates to an organic electroluminescent display element, and particularly to a packaging method of an organic electroluminescent display element. / / The principle of light emission of an Electro-Luminescence (EL) display element is to add electricity to a specific fluorescent or light-filling body to convert electrical energy ^ light energy ', depending on the materials used in the light-emitting layer, you can It is divided into EL display elements and inorganic EL display elements. Among them, organic rhenium display elements are laminated with organic thin films. They have the advantages of thin surface light, light weight, high light-emitting efficiency, low driving voltage, and other advantages. However, as the use time increases, water and oxygen in the environment can easily penetrate into the & display device, causing the separation between the cathode and the organic light-emitting layer, the material cracking, and extreme oxidation, thereby creating dark spots. This will greatly reduce the luminous quality such as the luminous intensity and luminous uniformity of the organic EL display element. Generally speaking, after the gold electrode and the organic light-emitting film are evaporated on the glass substrate of the organic EL display element, the element on the surface of the substrate is sealed with a back cover. In addition, in order to prolong the service life of organic EL display elements, a desiccant is added to absorb the moisture inside the display element, the moisture and oxygen infiltrating into the outside, and the gas out phenomenon caused by the frame adhesive. Infiltration of moisture and so on. In addition, in order to further correct the defects of the dark spots, many techniques have been developed to reduce humidity, such as direct coating of light-hardening resin on two glass substrates, metal oxides on the mine, gas φ, sulfide, and t-caps. Methods such as waterproof protective film and the use of a closed back cover are still found to be shortcomings such as leakage current, interference, and oxide dissolution. US Patent No. 5,882,76 1 discloses an organic display element. As shown in item i, an organic EL display element 10 includes a glass substrate 12 and a purple substrate.

1222838 V. Description of the invention (2) ^ The sealant layer 14 made of uv-hardened glue is coated on the glass substrate 12 and the back cover 16 is adhered by the sealant layer 14 It is bonded to the surface frame of the glass substrate 12 and is then packaged to include a laminate 20 on the surface of the glass substrate 12. The layer 20 is formed by an electric material I: a light material layer M and a cathode metal layer 26. A drying layer 28 is provided on the inner side wall of the bottom of the splicing plate, and an inner space 18 is separated by the toilet bowl 20, and the inner space is composed of barium oxide (Ba0) and oxidized H solids. Moisture and maintain its own solid state. (#The sealant used in the sealant layer is mainly epoxy resin

28 to block the penetration of water vapor and benefit, so only the dry layer luminous quality. If you want to solve the problem, you must ensure that the display element is 10th, and you must consider the following two methods to replace the sealant layer: Low water vapor / oxygen transmission rate, and two, while maintaining high adhesion It is compatible with the thermal expansion coefficient of glass transition temperature and contact angle, and suitable materials. Second, a large number of Sarri, so far it has not been possible to develop the amount of calcium (Ca) to improve Barium oxide ⑽) and oxygen have been confirmed by experiments when the layer 28 is dried :; the moisture absorption of layer 28 ', but the moisture will not increase, so = ㈣, its adsorption is here, in order to achieve sound blocking ; J ^ T effect, the present invention proposes a kind of "display: === 0628-6045tw. Page 5 1222838 V. Description of the invention (3) To solve the problems caused by the conventionally produced glass substrate of the present invention. An organic electrical excitation layer, an object; one layer is coated on the periphery; the frame is connected to the bottom of the back cover, and is arranged at the frame by a dry organic layer on the surface. The light-emitting material is coated with glass-based elements, including: : Is a laminated layer composed of an anode conductive layer And a back cover light display is provided with a light emitting element, a layer and a frame on the surface of the cathode metal plate; a plastic frame is connected to the edge on the surface of the glass substrate, and the frame is in a closed space. The surface of the glass substrate that surrounds the dry layer is edge-bonded, designed with an inventive lift plate and opposite to the bottom of the groove; an adhesive layer; and a layer formed to form another one to have: should be half of the groove of the light-emitting element Permeable film is used to fix and cover the light-emitting display element of the groove. It is located on the inner side wall of the back cover. A hydrophobic coating is a gas but not water-permeable coating on the opening of the groove. The material is part of the opening. The diagram is briefly explained. The first diagram is a schematic sectional view showing a conventional organic EL display element. The second diagram is a schematic sectional view of an organic EL display element according to the first embodiment of the present invention. A schematic cross-sectional view of an organic EL display element according to a second embodiment of the present invention is shown. Symbol description Organic EL display elements ~ 30, 50; glass substrate ~ 32;

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Anode conductive layer ~ 36; Cathode metal layer ~ 40; Moon plate ~ 4 4; Improved back cover ~ 48 Hydrophobic coating ~ 54; Adhesive layer ~ 58. Light-emitting element ~ 3 4; Organic light-emitting material layer ~ 38; Sealing layer ~ 4 2; Drying layer ~ 4 6; Trench ~ 52; Semi-permeable membrane ~ 5 6; First embodiment element ^ == 2 图 '其FIG. 32 is a schematic diagram showing a certain surface of an organic EL display panel 32 according to the first embodiment of the present invention. An organic tritium display element 30 includes a glass bulb 36, a light-emitting element 34 on the surface, and a light-emitting material layer 38 and a cathode metal layer 40, which are formed by an anode. The conductive layer 36 mainly uses indium-tin oxide (η = Γϋη Gxide 'ITG) as a transparent conductive material, and emits light :: Not shown Secondly, a hole transport layer (not shown) and an electron transport frame are formed to form a iu is coated on the outermost periphery of the glass substrate 32. The first closed loop (closed loop) is used. The main use of the plate 32 is t2. The frame of the back cover 44 is The back cover 44 is sealed in the junk base at the joint of the surface frame of a certain plate 32. The back cover 44 is sealed to form a closed space. Its composition / Ming metal / polymer / / glass or Laminated film plate (such as: in addition to the-dry layer 46 milk: /: stacked template). It is located inside the sealant layer 42 and is coated on the frame of the glass substrate 32 and blocks it. Sowing and adsorbing water vapor, 1 ^ H loops are mainly used for the infiltration of hole lice, and can provide partial adhesion.

1222838 V. Description of the invention (5) It is located inside the sealant layer 42 to form a second closed loop, which is mainly used to block and absorb the penetration of moisture and oxygen, and can provide partial adhesion. The sealant layer 42 of the first closed loop is made of ultraviolet curing adhesive, which has excellent adhesion to metal or glass, so it can provide the bonding effect between the glass substrate 32 and the back cover 44. The composition of the dry layer 46 of the second closed loop includes an adhesive UV-curing adhesive and a composite material having ^, moisture, oxygen, impurities, and solutes. The composite material may be an inorganic adsorption material or an organic adsorption material. Example: Monomer (m〇n〇

Polymer), copolymer, semi-IPN, or IPN. The best combination of adsorption materials used in the present invention includes silicon (siHcon), oxide (Al2O3), oxide # 5 (CaO), and oxidized stone (si02). According to the organic EL display element 30 described above, after the light-emitting element 34 is manufactured by the packaging method of the present invention, the first sealant layer 42 can be simultaneously produced on the frame of the glass substrate 32 by spraying, printing, or other deposition techniques. And the dry layer 46 of the second closed loop line can also be made at the inner side wall frame of the back cover 44 with the dry layer 42 and the dry layer 46. The back cover 44 encapsulates the surface elements of the glass substrate 32. Compared with Xi '= surgery, the present invention can complete the coating of the sealant layer 42 and the drying layer 46 at the same time and omit the desiccant injection step, so the entire packaging step becomes easier. Secondly, because the dried layer 46 can provide partial adhesion, resistance to the infiltration, the infiltration of water and oxygen, absorption of impurities and solutes inside, and the problem caused by the phenomenon of outgassing, so the drying is omitted; ' :,? The design of the glue layer 42 and the drying layer 46 can still achieve the effect of low permeability and low water vapor / oxygen permeability.卞,, 隹

1222838 V. Description of the invention (6) Second embodiment indicator: two three-dimensional diagrams: display / invention of the organic EL display of the second embodiment EL display element: two; Element 5. Provide: = This: In the second embodiment of the month, there is the infiltration of water vapor into the ship. change? m "Ten, it can effectively block too much 52, because the bottom of the inner wall of the moon plate 48 contains a groove-the position of the hydrophobic member 34 'and the bottom of the groove 52 is provided with an L-semi-permeable ^ ° In addition '& The bottom of the inner wall of the good-type back cover 48 is not 不 mi ~ Permeable film) 56, which is made of water-permeable gas ΐ 2 material' can be provided by coating on the opening frame 8 of the groove 52 Adhesiveness, to fix and cover the groove ill ^, the moisture inside the organic EL display element 50 can penetrate into the groove 52, and the moisture in the groove 52 is easily caused by the hydrophobic coating 54 Condensed into waterdrops. As for the water-impermeable properties of these waterdrops 56, they remain in the grooves, ^ = in the display element 50. Therefore, the modified backstop Zhiran-human ο adsorption into the display layer 46 & Pi $$ # 盍 板 48 design can share drying two 46: and the attached hydro-rolling will help increase the drying layer | life. In addition, if coated in the groove 5 is used; 58 uses a drying layer The material of 46 includes ultraviolet curing glue (silicon), oxide (Al203), oxidation dance (Si〇2), etc. But it provides semipermeable ^ Xi provide excellent emulsification stone adsorption of water vapor, then Shanghai fishing: those of the station, also member of the life 5〇 - further enhance display elements have hunger.

1222838 V. Description of the invention (7) Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make some changes without departing from the spirit and scope of the present invention. Changes and retouching, therefore, the protection scope of the present invention shall be determined by the scope of the appended patent application. ❹

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Claims (1)

Revised / Corrected / Added on 1st May 1222838 ——- i ^ -90108558 〇 Also the month and month of the sixth month, the patent application scope 1. An organic electroluminescent display element, including: a glass substrate, a light-emitting element is provided on the surface; a drying layer It is coated on the frame of the glass substrate surface, wherein the dry layer contains an adhesive and a composite material capable of adsorbing moisture, oxygen and / or impurities; a glue layer is coated on the frame of the glass substrate surface And surrounds the periphery of the dry layer; and a back cover 'whose frame is joined to the surface frame of the glass substrate to form a closed space. 2. The organic electroluminescent display element according to item 1 of the scope of patent application, wherein the adhesive is composed of an ultraviolet curing adhesive. 3 · The organic electroluminescent display element described in item 1 of the scope of the patent application, wherein the composite material can be selected from an inorganic adsorption material or an organic adsorbent material. 4 · The organic electroluminescent display as described in the scope of the patent application, item 1 The device, wherein the composite material includes si 1 ic ο η, alumina (A1203), calcium oxide (CaO), and / or silicon oxide (Si02). 5. The organic electroluminescent display element according to item 1 of the scope of the patent application, wherein the light-emitting element is a laminate composed of at least an anode conductive layer, an organic light-emitting material layer, and a cathode metal layer. 6. The organic electroluminescent display element according to item 1 of the scope of patent application, wherein the back cover includes: a groove, which is located at the bottom of the inner side wall of the back cover and corresponds to the light emitting element. Position; a hydrophobic coating is arranged at the bottom of the groove; 0628-6045TWF2; PHOELIP; 89033.p tc page 11 ^ layer, which is 'coated on the layer to fix * film' as the water-permeable gas 佝 "at the frame of the opening D of the groove; and mouth = cover the trench measures = water permeability The system is based on the use of adhesives, and the scope of the patent application is No. 6. The gas seat / ', 々COSCO adhesive layer contains the composite material of the organic electro-excitation light display element 〆 impurities described in the above item. 4 ions and an adsorbable water Gas, oxygen ... 8 · As claimed in the patent application No. ° 7 '..., wherein the adhesive is provided by the organic electro-excitation light display element q described in the item above, ^ by ultraviolet hardening and corrosion α, item 9 · As applied The scope of the patent is the result of the official library of the seventh museum. Among the composite materials, the organic electroluminescent display element described in item I, the inorganic adsorption material or the organic adsorption material can be used. The organic electro-excitation light display element as described in the item. The composite material includes silicon (silicon), aluminum oxide (203), calcium oxide (CaO), and / or silicon oxide (SiO2). 0628-6045TW2; PHOELIP; 8903 3.ptc p. 12